System.AsyncException: The Apex job named is already scheduled for execution.

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System.AsyncException: The Apex job named is already scheduled for execution.

Hi All,
When i was trying to schedule my class for every 15 miuntes to run. I was getting below error.
System.AsyncException: The Apex job named "Global App Logs Purge" is already scheduled for execution.

e.g.
Schedular_GlobalAppLogPurgeBatch globalPurgeBatchSchedular = new Schedular_GlobalAppLogPurgeBatch();
System.schedule('Global App Logs Purge', '0 0 * * * ? *', globalPurgeBatchSchedular);
System.schedule('Global App Logs Purge', '0 15 * * * ? *', globalPurgeBatchSchedular);
System.schedule('Global App Logs Purge', '0 30 * * * ? *', globalPurgeBatchSchedular);
System.schedule('Global App Logs Purge', '0 45 * * * ? *', globalPurgeBatchSchedular);

When i change the all the 4 job name from "Global App Logs Purge" to "Global App Logs Purge1","Global App Logs Purge2","Global App Logs Purge3","Global App Logs Purge4". I did not get any error. So the conclusion is every Job should be unique.

Corrected Code:
Schedular_GlobalAppLogPurgeBatch globalPurgeBatchSchedular = new Schedular_GlobalAppLogPurgeBatch();
System.schedule('Global App Logs Purge1', '0 0 * * * ? *', globalPurgeBatchSchedular);
System.schedule('Global App Logs Purge2', '0 15 * * * ? *', globalPurgeBatchSchedular);
System.schedule('Global App Logs Purge3', '0 30 * * * ? *', globalPurgeBatchSchedular);
System.schedule('Global App Logs Purge4', '0 45 * * * ? *', globalPurgeBatchSchedular);

I hope this will help you.

Have almost 7 years of experience and expertise in Core Java, JDBC, Servlet, JSP, Java Web Services and Struts, Oracle Database, MS SQL Server,Apex,Visual Force,Force.com platform. Good Experience on Oracle CRM ON DEMAND, Sales force CRM with ability to work independently and in a team environment. Good Analytical & Reasoning skills. Strongly creative in learning new technologies and systems, extremely passionate to work in a challenging place. Apart from that, I have very vast experience in integration and data migration from one system to other system. Certifications: 1. Salesforce Certified Platform Developer I 2. Salesforce Certified Administrator 3. Salesforce Certified Sales Cloud Consultant 4. Salesforce Certified Service Cloud Consultant 5. Oracle Certified Java Developer 6.Oracle Certified Web Component Developer 7. Oracle Certified SQL Associate

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